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STRAIN FIELD AND FRACTURE BEHAVIOR OF Ti/Al DISSIMILAR ALLOY JOINT UNDER IN SITU TENSILE TEST |
Zhiwu XU1,Zhipeng MA1,2,Jiuchun YAN1,Yuku ZHANG2,Xuyun ZHANG2 |
1 State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China 2 Department of Materials Science and Engineering, Northeast Petroleum University, Daqing 163318, China |
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Cite this article:
Zhiwu XU,Zhipeng MA,Jiuchun YAN,Yuku ZHANG,Xuyun ZHANG. STRAIN FIELD AND FRACTURE BEHAVIOR OF Ti/Al DISSIMILAR ALLOY JOINT UNDER IN SITU TENSILE TEST. Acta Metall Sin, 2016, 52(11): 1403-1412.
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Abstract The prospect of joining titanium and aluminum components into structures is desirable for a wide range of aerospace and automobile industry applications. One of the problems related with the joining processes for dissimilar metals such as Ti and Al is the formation of residual stress in the bonded joint, which has significant effect on the joint mechanical properties. In this work, joining of a titanium alloy to an aluminum alloy by ultrasonic assisted brazing using a Zn-Al filler metal was investigated. The microstructures of the titanium/aluminum brazed joints were determined by OM, SEM and TEM. The local tensile deformation characteristics of the brazed joints were also examined using the digital image correlation (DIC) methodology by mapping the local strain distribution during in situ tensile tests. The results showed that the Ti7Al5Si12 phase and the TiAl3 phase were formed at the titanium/brazing seam interface. The brazing seam was primarily composed of a Zn-rich phase and a Zn-24.14%Al (mass fraction) eutectoid structure. At the aluminum/brazing seam interface, no interfacial reaction layer was observed and the primary phase Zn-Al dendrites nucleated at the aluminum base metal and grew into the inside of the bonding region. A diffusion layer was formed in the aluminum base metal. It was found that the tensile deformation of the brazed joints was highly heterogeneous, which led to the deflection of the crack during propagating in the joint. The fracture initiated at the Zn-rich phases, where contained the highest stress concentration due to their low elastic modulus, and propagated in the Zn-rich phases or through the interface between Zn-rich phase and Zn-Al eutectoid structure.
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Received: 28 March 2016
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Fund: Supported by National Natural Science Foundation of China (Nos.51075104 and 50905044) |
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